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From my knowledge on NFC, which isn't a lot, it seems like it would be very easy to copy an NFC token.

What methods can be used to prevent people from making unauthorised copies of the NFC tokens?

When I say tokens I mean the ones found in for entry fobs and on advertising etc.. the ones that are in a constant state.

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    potential duplicate: security.stackexchange.com/questions/70828/… – schroeder May 24 '17 at 13:16
  • I don't think it is a duplicate. My question asks how to prevent it rather if it is possible to duplicate. – Terry May 24 '17 at 13:44
  • the answer there answers you here: PKI, rotating codes – schroeder May 24 '17 at 13:51
  • you can't; it's basically a barcode without the bars... – dandavis May 25 '17 at 7:37

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